How to lighten or change colour of outdoor cement garden tiles?

Hi, most certainly a power washer will make the tiles slightly lighter. I have in the past painted concrete slabs with Masonary paint. But if there is to be a lot of tread on the path you'll probably have to touch it up every year or so. Best thing to do would be to power wash a corner or a part under a plant pot etc. Then you'll get a true feel for what colour it is. Let it dry be for you make you decision Cheers David @Peacock 🦚 Hope this helps.

Pour pure patio & brick cleaner acid over the slabs, I done this to my patio I built over lockdown and accidentally faded the colour from dark grey to a light grey.... My slabs were cheap concrete ones bought from selco like 2/3 pound a slab, you are supposed to water down the acid for general use and I learned this the hard way but if you want to fade the colour this will probably work. Regards Frankie BT Roofing Services

Take a dump on it spread it out with your hands make sure you get all the edges the natural acids from your Ken will soften the dirt spray off with a hose and hey presto like new